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  4. CVE 2026 114134 black github action installs unvalidated required
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Back to active CVEs
High severityCVE-2026-114134GHSA-CG8M-R9F2-5WM2

Black: GitHub Action installs unvalidated required-version from pyproject.tomlCVE-2026-114134

Answer in brief

CVE-2026-114134 records a High severity vulnerability in Black: GitHub Action installs unvalidated required-version from pyproject.toml. The current sources do not mark it as known exploited. The current feed maps black (pip). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 22, 2026Updated Oct 22, 2026Source checked Oct 22, 2026First seen by HOL Oct 22, 2026Material review Oct 22, 2026
Upstream Advisory

Key facts

Risk
High
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps black (pip). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
blackpip<26.10.126.10.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for black.
  2. 2Review the reported fix. Update black to 26.10.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 22, 2026

    Evidence: source:ghsa:source_dates:source-dates:record

  2. Source modified

    Oct 22, 2026

    Evidence: source:ghsa:source_dates:source-dates:record

  3. First seen by HOL

    Oct 22, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

### Summary The GitHub Action bundled with Black can read the version from `tool.black.required-version` if `use_pyproject` is set to True. This version is not validated and therefore can be used to execute untrusted code in the context of a victim's repository. ### Details This is similar to the previous CVE-2026-31900. The value in `tool.black.required-version` is accepted as the version to be installed by the action without validation. ### Proof of concept Reproduction requires a victim to use Black's GitHub Action with `use_pyproject: true`. The attacker would then issue a PR to the victim's repository with `pyproject.toml` edited so that Black points to a malicious repository. ### Impact This is a remote code execution vulnerability impacting users using the GitHub Action bundled with psf/black and using the `use_pyproject: true` setting.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • CloudPirates Open Source Helm Charts: pull_request_target workflow vulnerable to cache poisoning and OIDC token theftAlso CWE-829
  • OpenTelemetry Python: Unbounded tracestate parsing in opentelemetry-apiSame pip ecosystem
  • GraphQL-core: Denial of service via quadratic complexity in the OverlappingFieldsCanBeMerged validation ruleSame pip ecosystem
  • GraphQL-core: Denial of service via comment tokens bypassing the parser's max_tokens limitSame pip ecosystem

Record context

Vulnerability class
RCE
EPSS
Not reported
CWE IDs
CWE-829
Source
GitHub Security Advisories
Source checked
Oct 22, 2026
References
5 linked sources
Open source record